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基于NOMA的认知无线电网络功率分配
吴静芳, 李莉, 冀笑伟, 魏爽
上海师范大学 信息与机电工程学院, 上海 201418
摘要:
考虑采用非正交多址接入(NOMA)技术的认知无线电网络下行链路的功率分配问题,旨在最大化接入系统的次用户数,提升系统的频谱效率.在不影响主用户通信的情况下,对次用户进行合理的功率分配,使得系统接入的次用户数最大化.在系统可用功率未得到充分利用时,考虑在接入系统的次用户间对未利用的功率再次进行功率分配,提升系统的频谱效率.仿真结果显示:当次用户最小速率为2.5 bit·s-1,请求接入系统的次用户数为10时,频谱效率可提升13%.
关键词:  认知无线电网络  非正交多址接入(NOMA)  功率分配
DOI:10.3969/J.ISSN.1000-5137.2020.01.005
分类号:TN929.5
基金项目:国家自然科学基金(61701307);上海市自然科学基金(19ZR1437600)
Power allocation for cognitive radio networks based on NOMA
WU Jingfang, LI Li, JI Xiaowei, WEI Shuang
College of Information, Mechanical and Electrical Engineering, Shanghai Normal University, Shanghai 201418, China
Abstract:
The downlink power allocation of cognitive radio networks using non-orthogonal multiple access (NOMA)technologies was considered and studied in this paper,with the purpose of maximizing the number of secondary user in the access system and improving the system’s spectral efficiency.Without affecting the communication of primary user,a reasonable power allocation was performed for the secondary user,which lead to the maximum number of secondary user.When the system available power was not fully utilized,re-allocation the unused power among the secondary users accessing the system was considered to improve the system’s spectral efficiency.Simulation results showed that when the minimum rate of secondary users was set as 2.5 bit·s-1 and the number of secondary user requesting access to the system was set as 10,the spectral efficiency was improved by 13%.
Key words:  cognitive radio network  non-orthogonal multiple access(NOMA)  power allocation